According to OSHA regulations, what must employers provide for their employees?

Employers are required to provide a clean area for employees to change clothes when they are potentially exposed to hazardous substances, such as lead. This is crucial for maintaining hygiene and preventing contamination that could be carried outside of the work environment. By allowing employees to change into clean clothes at work, employers help reduce the risk of lead exposure to the employees and their families, as well as the broader community.

The other options do not fall under mandatory requirements outlined by OSHA. Daily health check-ups, while beneficial, are not universally required unless a particular job poses a significant risk where ongoing health monitoring is necessary. Flexible work hours and free transportation, while potentially enhancing the workplace environment or attracting employees, are not regulations that OSHA enforces. Thus, maintaining a clean changing area is the key requirement that directly addresses health and safety concerns in the workplace regarding hazardous materials.